﻿//-----------------------------------------------------------------------
// <copyright file="EllipseEntity.cs" company="Nathan Miller">
// Copyright (c) Nathan Miller.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
//-----------------------------------------------------------------------
namespace TileTool.Base.Scene.Entity.Ellipse
{
    using TileTool.Common.Math;
    using TileTool.Render;
    using TileTool.Scene.Collision;
    using TileTool.Scene.Entity;

    /// <summary>
    /// Solid draw ellipse entity.
    /// </summary>
    public class EllipseEntity : EntityBase
    {
        #region Constructor

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="createData">Creation data for the entity.</param>
        public EllipseEntity(EntityCreateData createData) :
            base(createData)
        {
        }

        #endregion

        #region Methods - Public

        /// <summary>
        /// Draw the entity with the passed renderer.
        /// </summary>
        /// <param name="renderData">Rendering data. Always non-null.</param>
        public override void Draw(IRenderData renderData)
        {
            ICanvasRenderer renderer = renderData.Renderer;
            Vector2D pos = new Vector2D(Size.Width * 0.5f, Size.Height * 0.5f);

            renderer.DrawFilledEllipse(pos, this.Size, this.Color);

            base.Draw(renderData);
        }

        #endregion

        #region Methods - Protected

        /// <summary>
        /// Handle a point collision request.
        /// 
        /// Default implementation tests for a point inside of the entity rectangle.
        /// </summary>
        /// <param name="request">Collision request.</param>
        /// <returns>Returns the entity that was hit or null if no entity was hit.</returns>
        protected override IEntity HandlePointCollision(PointCollisionRequest request)
        {
            Size2D halfSize = Size.Half;

            if ((halfSize.Width <= 0.0f) || (halfSize.Height <= 0.0f))
            {
                return null;
            }

            Matrix2D invMatrix = Matrix.Invert();
            Vector2D testPtLocal = invMatrix * request.Point;

            if (!CollisionUtility.PointInEllipse(
                new Vector2D(halfSize.Width, halfSize.Height),
                halfSize.Width,
                halfSize.Height,
                testPtLocal))
            {
                return null;
            }

            return this;
        }

        #endregion
    }
}
